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2000 chevy blazer fuel problem

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Feb 21, 2010, 10:27 AM

Post #1 of 6 (5319 views)
2000 chevy blazer fuel problem Sign In

Mornin', I'm dealing with a fuel problem on a 2000 Chevy Blazer with a 4.3 (W) with approx 140,000. It all started with the the gas gauge stopping @ 1/2 a tank. Then it went to not wanting to start. I would listen for the pump wait a second and try turning her over. This would take a few times to do and felt like it caught by accident, run rough for a few seconds and then run fine. As time went by , it got worse . The other day I went through the same starting regamarooe and headed down the high way. As I steped on the gas, it just sat there ( red lined the RPMs ) but would not go over 50. I made it safely to the next exit. Thinking maybe the fuel filter was cloged. I went to have it changed . After it was changed , the truck won't start. I had it towed to a repair shop and we checked the pressure in the line. It reads 40 PSI and looses pressure . It sounds like air is hissing out of the injectors. I can't see them because they are in the manifold , but you can hear them. * truck will start for a second with starting fluid*. Do you think there is just not enough PSI from the pump and replace the pump or should I just go ahead and replace the spyder. Thanks in advance for any sugestions, Dan

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Feb 21, 2010, 3:08 PM

Post #2 of 6 (5309 views)
Re: 2000 chevy blazer fuel problem [In reply to] Sign In

These things want their fuel pressure the “spider” is a mechanical injector system; that takes pressure to open the valve(s).
A central fuel control valve is opened electronically and allows fuel under pressure to the poppet valves (injectors). This pressure is what opens the injectors; somewhat like an old diesel style injector worked.
45 psi is not enough pressure to open the injectors; the spec calls for something like 55-60 psi. Maybe why you got away with what you've been doing; is that you where lucky to get it to fire. Once running the charging system of the vehicle raised the system voltage enough to spin this weak pump fast enough to keep it running.
Until now; that is? LOL


PS; Like the name; just a little longer then mine. But on my passport it is spelled Danny.

Canadian "EH"

(This post was edited by DanD on Feb 21, 2010, 3:11 PM)


Feb 21, 2010, 4:27 PM

Post #3 of 6 (5300 views)
Re: 2000 chevy blazer fuel problem [In reply to] Sign In

 So what you are saying, my friend ,is I should replace the pump and work back from there ?

Veteran / Moderator

Feb 21, 2010, 4:51 PM

Post #4 of 6 (5297 views)
Re: 2000 chevy blazer fuel problem [In reply to] Sign In

40 psi is not enough pressure to open the poppet valves; so yes if you're sure of the pressure readings and the pump is being supplied the proper voltages and ground; replace the pump.


Canadian "EH"


Feb 21, 2010, 5:36 PM

Post #5 of 6 (5291 views)
Re: 2000 chevy blazer fuel problem [In reply to] Sign In

Thank you for sticking with the post Dan. I'll pick up the pump in AM and post results in PM. Please check back my friend. Stay warm up there, DannnyD


Feb 24, 2010, 10:51 AM

Post #6 of 6 (5274 views)
Re: 2000 chevy blazer fuel problem [In reply to] Sign In

Mornin' DanD, All worked out fine after installing the new pump. thanks again for ALL your help. It is the people like yourself on this forum that makes this site one of the best I've come across . It is nice to know a " Shadetree Mechanic", like myself, can get great advice. Take care my friend, DannyD

2000 chevy blazer fuel problem

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